And when I try again to get into @TSB app, it asks me if I want to set up the app again. No I don’t. You’ve already made me move from one app to another recently. Very poor customer service pic.twitter.com/ixGKCgsPlv

The FT focuses on the prospect that City and data watchdogs will savage the bank, saying:

Regulators are probing computer problems at TSB that left many customers of the UK bank unable to check their accounts and gave some access to other people’s money after it switched to new systems over the weekend.

The problems, which provoked a flurry of complaints on social media, followed a scheduled shutdown of TSB’s online and mobile banking applications over the weekend while it transferred 1.3bn customer records from its former parent Lloyds Banking Group.

The Information Commissioner’s Office — the UK privacy watchdog — said: “We are aware of a potential data breach in relation to the TSB and are making enquiries.”

The Financial Conduct Authority said it was “aware of the issue” and was “liaising with the firm”....

As we head into the night, TSB are still telling customers that they don’t know when the IT outage will be fixed.

TSB (@TSB)

I'm sorry Dan, we don't have any timescales that we're able to provide at the moment. However, we are working to fix it as fast as we can. I appreciate how frustrating this must be and I can't apologise enough that we're unable to be more specific. Jon

Lib Dem peer blasts TSB CEO

TSB’s chief executive Paul Pester has kept a low profile today - he’s not tweeted about the IT problems at all.

Liberal Democrat peer Paul Scriven has laid into Pester on Twitter this evening, calling for answers about what’s gone wrong:

Paul Scriven (@Paulscriven)

@PaulPester after getting text to say my balance is £0 decided to check. No access. Just remind my how much did your parent group say this IT change will save? Can tell you you've lost your reputation!

@TSB_PubAffairs and @TSB@PaulPester stop telling me and other customers you have an intermittent problem. You clearly have a major systems failure . Be honest. It's bad enough for us your customers without you taking us for mugs

Data visualisation firm Bright Analytics is worried that it won’t be able to pay its employees, or settle other bills, until TSB fixes its problems:

Bright Analytics (@brightanalytics)

hi @tsb. appreciate you're having a terrible time today and must be sick of hearing from angry customers but I have a business to run and still cannot login to online banking. I need to make payments, I need to pay staff. what is happening??? a proper update is long overdue.

TSB claims to have such issues, but other customers have reported similar problems today:

jacqueline (@jacohara88)

@TSB I seriously can't believe I had access to someone else's account via the online banking app. This is a serious data breached. TSB get the finger out all this was meant to be sorted by 6pm yesterday 🙄🙄🙄